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184
Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey
"... Abstract—The use of distributed energy resources is increasingly being pursued as a supplement and an alternative to large conventional central power stations. The specification of a powerelectronic interface is subject to requirements related not only to the renewable energy source itself but also ..."
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Abstract—The use of distributed energy resources is increasingly being pursued as a supplement and an alternative to large conventional central power stations. The specification of a powerelectronic interface is subject to requirements related not only to the renewable energy source itself but also to its effects on the power-system operation, especially where the intermittent energy source constitutes a significant part of the total system capacity. In this paper, new trends in power electronics for the integration of wind and photovoltaic (PV) power generators are presented. A review of the appropriate storage-system technology used for the integration of intermittent renewable energy sources is also introduced. Discussions about common and future trends in renewable energy systems based on reliability and maturity of each technology are presented. Index Terms—Direct drives, doubly fed induction generator (DFIG), flywheel, hydrogen, multilevel converter topologies, supercapacitors, superconducting magnetic energy storage (SMES), wind diesel. I.
Fundamental frequency switching strategies of a seven level hybrid cascaded Hbridge multilevel inverter
- IEEE Trans. Power Electron
, 2009
"... Abstract—This paper presents a cascaded H-bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters re-quire n dc sources for 2n + 1 levels. Without requiring trans-formers, the scheme proposed here allows the use of ..."
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Cited by 20 (0 self)
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Abstract—This paper presents a cascaded H-bridge multilevel inverter that can be implemented using only a single dc power source and capacitors. Standard cascaded multilevel inverters re-quire n dc sources for 2n + 1 levels. Without requiring trans-formers, the scheme proposed here allows the use of a single dc power source (e.g., a battery or a fuel cell stack) with the remaining n − 1 dc sources being capacitors, which is referred to as hybrid cascaded H-bridge multilevel inverter (HCMLI) in this paper. It is shown that the inverter can simultaneously maintain the dc voltage level of the capacitors and choose a fundamental frequency switch-ing pattern to produce a nearly sinusoidal output. HCMLI using only a single dc source for each phase is promising for high-power motor drive applications as it significantly decreases the number of required dc power supplies, provides high-quality output power due to its high number of output levels, and results in high con-version efficiency and low thermal stress as it uses a fundamental frequency switching scheme. This paper mainly discusses control of seven-level HCMLI with fundamental frequency switching con-trol and how its modulation index range can be extended using triplen harmonic compensation. Index Terms—Fundamental frequency modulation control, hy-brid cascaded H-bridge multilevel inverter (HCMLI), triplen har-monic compensation. I.
Cascaded Multilevel Inverter With Regeneration Capability and Reduced Number of Switches
"... Abstract—Multilevel converters are a very interesting alternative for medium and high power drives. One of the more flexible topologies of this type is the cascaded multicell converter. This paper proposes the use of a single-phase reduced cell suitable for cascaded multilevel converters. This cell ..."
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Cited by 14 (0 self)
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Abstract—Multilevel converters are a very interesting alternative for medium and high power drives. One of the more flexible topologies of this type is the cascaded multicell converter. This paper proposes the use of a single-phase reduced cell suitable for cascaded multilevel converters. This cell uses a reduced singlephase active rectifier at the input and an H-bridge inverter at the output side. This topology presents a very good performance, effectively controlling the waveform of the input current and of the output voltage and allowing operation in the motoring and regenerative mode. The results presented in this paper confirm that this medium voltage inverter effectively eliminates low frequency input current harmonics at the primary side of the transformer and operates without problems in regenerative mode. Index Terms—Multilevel systems, pulsewidth modulated power converters, regeneration capability. I.
Pulsewidth modulations for the comprehensive capacitor voltage balance of n-level diode-clamped converters
- Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
, 2008
"... Abstract—In the previous literature, the introduction of the virtual-space-vector (VV) concept for the three-level, three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies, guaranteeing a dc-link capacitor voltage balance in every switching cycle ..."
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Cited by 12 (2 self)
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Abstract—In the previous literature, the introduction of the virtual-space-vector (VV) concept for the three-level, three-leg neutral-point-clamped converter has led to the definition of pulsewidth modulation (PWM) strategies, guaranteeing a dc-link capacitor voltage balance in every switching cycle under any type of load, with the only requirement being that the addition of the three phase currents equals zero. This paper presents the defini-tion of the VVs for the general case of ann-level converter, suggests guidelines for designing VV PWM strategies, and provides the ex-pressions of the leg duty-ratio waveforms corresponding to this family of PWMs for an easy implementation. Modulations defined upon these vectors enable the use of diode-clamped topologies with passive front-ends. The performance of these converters operated with the proposed PWMs is compared to the performance of alter-native designs through analysis, simulation, and experiments. Index Terms—Capacitor voltage balance, diode-clamped, mul-tilevel, pulsewidth modulation (PWM), virtual vector. I.
Digital control of three phase three-stage hybrid multilevel inverter,”IEEE
- Transactions on Industrial Informatics
, 2013
"... Abstract—Three-stage 18-level hybrid inverter design with novel control method is presented. The inverter consists of main high-, medium-, and low-voltage stages connected in series from the output side. The high-voltage stage is a three-phase, six-switch conventional subinverter. The medium- and lo ..."
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Cited by 11 (6 self)
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Abstract—Three-stage 18-level hybrid inverter design with novel control method is presented. The inverter consists of main high-, medium-, and low-voltage stages connected in series from the output side. The high-voltage stage is a three-phase, six-switch conventional subinverter. The medium- and low-voltage stages are made of three-level subinverters constructed by H-bridge units. The proposed control strategy assumes a reference input voltage vector and aims to approximate it to the nearest inverter vector. The control concept is based on holding the high-voltage state as long as it is feasible to do so. The reference voltage vector has been represented in a 60-spaced two axis coordinate system to reduce the computational effort. The concept of the staged-control has been presented, the transformed inverter vectors and their relation to the switching variables have been defined, and the implementation process has been described. The test results verify the effectiveness of the proposed strategy in terms of computa-tional efficiency as well as the capability of the inverter to produce very low distorted voltage with low switching losses. Index Terms—Digital control, extended space vector transfor-mation, multilevel converters, pulse width modulation (PWM), space vector modulation (SVM), three-stage hybrid topology, voltage source inverters (VSI). I.
Voltage Control of Three-Stage Hybrid Multilevel Inverter Using Vector Transformation
- IEEE Transactions on Power Electronics
, 2010
"... space vector transformation. Three-stage eighteen-level hybrid inverter design with novel control method are presented. The inverter consists of main high-voltage, medium-voltage and low-voltage stages connected in series from the output side. The high voltage stage is a three-phase, six-switch conv ..."
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Cited by 10 (5 self)
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space vector transformation. Three-stage eighteen-level hybrid inverter design with novel control method are presented. The inverter consists of main high-voltage, medium-voltage and low-voltage stages connected in series from the output side. The high voltage stage is a three-phase, six-switch conventional sub-inverter. The medium and low voltage stages are made of three-level sub-inverters constructed by H-bridge units. The proposed control strategy assumes a reference input voltage vector and aims to approximate it to the nearest inverter vector. The control concept is based on holding the high voltage state as long as it is feasible to do so. The reference voltage vector has been represented in a 60°-spaced two axis coordinate system to reduce the computational effort. The concept of the staged-control has been presented, the transformed inverter vectors and their relation to the switching variables have been defined, and the implementation process has been described. The test results verify the effectiveness of the proposed strategy in terms of computational efficiency as well as the capability of the inverter to produce very low distorted voltage with low switching losses. 1
State Feedback Control of Multilevel Inverters for DSTATCOM Applications
- IEEE Trans. on Power Delivery
, 2007
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Cited by 9 (0 self)
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reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained
A Multilevel Modular Converter for a Large, Light Weight Wind Turbine Generator
, 2010
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Voltage-source active power filter based on multilevel converter and ultracapacitor DC link
- IEEE Trans. Ind. Electron
, 2006
"... Abstract—A new topology for active power filters (APF) using an 81-level converter is analyzed. Each phase of the converter is composed of four three-state converters, all of them connected to the same capacitor dc link voltage and their output connected in series through output transformers. The ma ..."
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Cited by 8 (0 self)
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Abstract—A new topology for active power filters (APF) using an 81-level converter is analyzed. Each phase of the converter is composed of four three-state converters, all of them connected to the same capacitor dc link voltage and their output connected in series through output transformers. The main advantages of this kind of converter are the negligible harmonic distortion obtained and the very low switching frequency operation. The single-phase equivalent circuit is analyzed and their governing equations derived. The dc link voltage control, based on manipulating the converter’s voltage phase, is analyzed together with the circuit’s characteristics that determine the capability to draw or deliver active and reactive current. Simulation results for this application are compared with conventional pulsewidth-modulated (PWM) converters, showing that this filter can compensate load current harmonics, keeping better-quality sinusoidal currents from the source. The simulated configuration uses a 1-F ultracapacitor in the dc link, making it possible to store energy and deliver it during short voltage dips. This is achieved by applying a modulation control to maintain a stable ac voltage during dc voltage drops. A prototype of the filter was implemented and tested, and the obtained current waveforms showed to be as good as expected. Index Terms—Active filters, multilevel systems. I.
A flexible selective harmonic mitigation technique to meet grid codes in three-level PWM converters
- IEEE Trans. Ind. Electron
, 2007
"... All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately. ..."
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Cited by 7 (0 self)
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All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
